Person of Interest S02E20

Plot: Reese first catches up with the latest number, Dr. Richard Nelson, when he is being awarded the title of professor emeritus at a lavish dinner banquet. Dr. Nelson is a well respected and renowned cardiac surgeon and researcher, with his credentials suggesting that he is the target. That is indeed the case, but Reese and Finch are too late: someone has poisoned Dr. Nelson after he ingested something at that banquet that was slipped into his food or drink. Dr. Nelson first believes that Reese is the culprit.